outpost king is caught between hills full of taliban. if the americans leave, militants from pakistan will flow through the valley. if they stay, every few days this happens. the mortars hit the base. the last attack was long enough ago there's panic, they're worried the taliban have been preparing a big one. after days of nothing, the insurgents are finally beginning an attack from all sides. >> fire. >> command hustle up, grab it and get ready. >> reporter: they use mortars first, aiming for taliban dark into the hills but the incoming fire is very accurate here. >> fire. >> go, go, go, go, go! >> reporter: they arrange cover from heavy machine guns. >> grab the round. as soon as they go, drop it. >> reporter: the bullets are too close. >> never mind. >> reporter: locals scatter, just before huge american firepower has the last word. >> they just fired it. >> oh! >> reporter: four massive air strikes across the hills and then the taliban falls silent. america knew why it came here but isn't sure why it's staying. >> can we get a police